package com.yymx.toback.common.util;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.UnknownHostException;

public class ClientUtil {
	/**
	 * 获取客户端真实ip
	 * @param request
	 * @return
	 */
	public static String getClientIp(HttpServletRequest request){
		String ip = request.getHeader("x-forwarded-for");
		if (ip==null||ip.length()==0||"unknown".equalsIgnoreCase(ip)) {
			ip = request.getHeader("Proxy-Client-IP");
		}
		if (ip==null||ip.length()==0||"unknown".equalsIgnoreCase(ip)) {
			ip = request.getHeader("WL-Proxy-Client-IP");
		}
		if (ip==null||ip.length()==0||"unknown".equalsIgnoreCase(ip)) {
			ip = request.getRemoteAddr();
		}
		return ip;
	}

	/**
	 * 获取用户真是Ip地址
	 *
	 * @param request
	 * @return
	 */
	public static String getClientIpAddress(HttpServletRequest request) {
		String ipAddress = null;
		// ipAddress = this.getRequest().getRemoteAddr();
		ipAddress = request.getHeader("x-forwarded-for");
		if (!isIP(ipAddress) && (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress))) {
			ipAddress = request.getHeader("Proxy-Client-IP");
		}
		if (!isIP(ipAddress) && (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress))) {
			ipAddress = request.getHeader("WL-Proxy-Client-IP");
		}
		if (!isIP(ipAddress) && (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress))) {
			ipAddress = request.getRemoteAddr();
			if (ipAddress.equals("127.0.0.1")) {
				// 根据网卡取本机配置的IP
				InetAddress inet = null;
				try {
					inet = InetAddress.getLocalHost();
				} catch (UnknownHostException e) {
					e.printStackTrace();
				}
				ipAddress = inet.getHostAddress();
			}

		}
		// 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
		if (ipAddress != null && ipAddress.length() > 15) { // "***.***.***.***".length()
			String[] ips = ipAddress.split(",");
			for (String string : ips) {
				if(isIP(string)){
					ipAddress = string;
					break;
				}
			}
		}
		return EmptyUtil.isNotEmpty(ipAddress)?ipAddress.trim():ipAddress;
	}

	private static boolean isIP(String ip) {
		return !(EmptyUtil.isEmpty(ip) || ip.startsWith("10.") || ip.startsWith("192.168.") || ip.startsWith("172.") || ip.startsWith("127."));
	}

}
